Ab Roller - Fitness Abdominal Wheel Precision manufactured of high quality materials for maximum durability, safety, and load capacity Scientific design reduces noise, wear, and slip, while providing maximum comfort and effectiveness The single wheel is more stable than dual wheel models and has a floor-safe grip that reduces slip Hand grips are environmentally friendly, and reduce sweat absorption, odor, and bacterial growth Units lightweight design, 700 g (1.54 lbs.), makes it very portable so you can keep fit on the go